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Alternator/ Starter Drive Gears

Triumph Thunderbird & Thunderbird Sport · Clutch & Transmission incl. Gearchange Mechanism · 22 parts · 1 on the shelf in Brea

Exploded parts diagram — Alternator/ Starter Drive Gears, Triumph Thunderbird & Thunderbird Sport

Open this diagram in the interactive viewer → Click any callout on the drawing to jump to the part.

Motorcycles this catalogue covers

Thunderbird & Thunderbird Sport
1999

Our parts team checks fitment against your motorcycle before any order ships.

Every part on this diagram

1
T3150129
Bolt
Qty 1
M8 x 102.5mm
Triumph has stock
$3.98
Order-in Ask the parts desk
2
T3550022
Washer, Hardened, M8
Qty 2
Triumph has stock
$2.93
Order-in Ask the parts desk
3
T1220960
Gear assembly
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
4
T1220281
Sleeve
Qty 1
Availability unconfirmed
$38.61
Not on our shelf Ask the parts desk
5
3800019-T0301
Needle bearing
Qty 1
Triumph has stock
$63.35
Order-in Ask the parts desk
6
T3500201
Circlip, EXT, 23.5 x 1.2
Qty 1
Triumph has stock
$4.04
Order-in Ask the parts desk
7
1220330-T0301
Thrust washer
Qty 2
Triumph has stock
$0.35
Order-in Ask the parts desk
8
T3800011
Bearing, Ball, 254712
Qty 1
Triumph has stock
$40.57
Order-in Ask the parts desk
9
T1221025
Sprag and clutch assembly
Qty 1
If your engine number is 109315 or lower
Triumph has stock
$362.84
Order-in Ask the parts desk
9
T1221035
Sprag and clutch assembly
Qty 1
If your engine number is 109316 or higher
Triumph has stock
$362.84
Order-in Ask the parts desk
10
T3051063
Screw, Cap/Hd, M6 x 16, Enc, Raw
Qty 6
Triumph has stock
$0.53
Order-in Ask the parts desk
11
1220291-T0301
Spacer
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
12
T1220268
Shaft
Qty 1
* PART NO LONGER AVAILABLE *
No longer supplied by Triumph
$120.23
Not on our shelf Ask the parts desk
13
3800020-T0301
Bearing
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
14
T3551283
Washer, M10, 10.5x18x1.6, Slv
Qty 2
Triumph has stock
$1.86
Order-in Ask the parts desk
15
T3051062
Screw, M6 x 12, Enc, Raw
Qty 2
$1.36
In stock in Brea Ask the parts desk
16
T1220247
Housing
Qty 1
Triumph has stock
$58.98
Order-in Ask the parts desk
17
T1220325
Rubber damper
Qty 4
* PART NO LONGER AVAILABLE *
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
18
T3150125
Bolt
Qty 1
PART NO LONGER AVAILABLE - M6 x 16mm
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
19
3550031-T0301
Belleville washer
Qty 1
Triumph has stock
$0.90
Order-in Ask the parts desk
20
T1220307
Centre
Qty 1
PART NO LONGER AVAILABLE
No longer supplied by Triumph
No longer available
Not on our shelf Ask the parts desk
21
T3350112
Nut
Qty 1
Triumph has stock
$7.71
Order-in Ask the parts desk

Diagram and part data from Triumph’s own parts catalogue. Prices and availability are a dated snapshot, not a reservation. Fitment is Triumph’s data — send us the last six of your VIN if you want it checked before you order.

Southern California Motorcycles, 515 W Lambert Rd, Brea, CA 92821 · 714-256-6700

Triumph supply checked Aug 5, 2026 · Brea shelf Aug 18, 2026.